while in first-order form their Hamiltonian density is expressed as[1]}
\({\cal H}_\gamma (\vec{D},\vec{B}) &=& \frac{1}{2}\cosh \gamma \left(\vec{D}^2+\vec{B}^2\right)-\frac{1}{2}\sinh \gamma \sqrt{\left(\vec{D}^2-\vec{B}^2\right)^2+4\left(\vec{D}\cdot \vec{B}\right)^2}, \nonumber \\{\cal H}^{(RS)}_{\gamma }(\vec{R},\vec{R}^*) &=& \frac{1}{2}\cosh \gamma \,\vec{R}\cdot \vec{R}^* - \frac{1}{2}\sinh \gamma \sqrt{\vec{R}^2\,\vec{R}^{*2}},\) 
